"Since I Left You" is the debut studio album by The Avalanches. They started recording in 1999 and had used the working title of Pablo's Cruise. The duo primarily worked with a Yamaha Promix 01 and Akai S2000 samplers.

Band's members, Darren Seltmann and Robbie Chater, spent hours sampling music from vinyl records to create the songs on the album: Chater estimates that there are over 3,500 samples. After sampling and arranging, the pair would swap their tapes, listen to each other's ideas and expand on whatever they had heard. Despite working separately, both Chater and Seltmann had nearly identical studio set-ups.